Hi, friends:
I am a new member of this forum and I am searching for experienced advice. I have one Brazilian 1908 DWN 7 mm cal and one Brazilian 1908/34 CZ also in 7mm cal . I want to convert one to a .375 H&H and another to a big bore cal that can either be a .416 Rigby or a .458 Win Magnum, depending upon your advice. My doubts are:
1- Which of the two action would be better for each project?
2- Are Talley mounts and rings suitable for such calbers?

The choice of those calibers is that they will be mainly be used against feral water buffalos that I use to hunt here. I already use a Ruger M77 .375 H&H, but I need at least one more gun.

I think it is important to clearify that the work will be made by a very competent and wisdom gunsmith. In his opinion, both action can handle the .375 H&H and the .458 Win without problems,but this is not the case for the .416 Rigby. What do you think about that? Thank for the help.
Jano